Hey Marin, I encountered this error while setting my line up for tomorrow's scrimmage.
The thing is, I think the Active Bids module (great addition) refreshing causes this error. I happened to have a bookmarked guy ending in about 3 minutes when I went to set my lineup. I think when the auction is about to end it refreshes a lot more? So, when it refreshed, the entire page refreshed and led to the "oops" error.
When the auction ended and another guy came in the Active Bids who is about to end in a couple of hours, I set my lineup with no problems at all.
Then, I went to the Transfer List and bookmarked a random player that was about to end in a couple minutes and it happened again. So, I think there is a connection.
And another thing? What is this tick after my next opponents name in the "Your Next Game" module? I thought it was an indicator whether I set or not lineup, but it's there both before and after setting it.